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"Sauron would be very pleased, because our rings are made of hard-anodized, black 7050 aluminum with opposite holes for two rim locks if necessary.\r\nAvailable in 18” x 2.15”, 19” x 2.15” and 21” x 1.6” each with lasered X-GRIP logo."
<https://www.x-grip.at/product/x-grip-rims/>